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Finding the Fourth Proportional to 70,489.67, 105,660.26 and 28,399.64

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Solution

The fourth proportional to 70,489.67, 105,660.26 and 28,399.64 is: 42,569.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    70,489.67 : 105,660.26 = 28,399.64 : x
  2. Step 2: Convert to fraction form
    70,489.67/105,660.26 = 28,399.64/x
  3. Step 3: Cross multiply
    70,489.67x = 105,660.26 × 28,399.64
  4. Step 4: Simplify right side
    70,489.67x = 3,000,713,204.31
  5. Step 5: Solve for x
    x = 3,000,713,204.31/70,489.67
  6. Step 6: Final answer
    x = 42,569.55

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.